Brake-lining and method for preparing the same.



4 onian snares rann r ent ies.

WILLIAM D. PABDOE, 0F TRENTON, NEWJERSEY, ASSIG-NOB T0 THERMOID RUBBER CQMPANY, 01E HAMILTON TOWNSHIP, TRENTON, NEW JERSEY, A CORPORATION OF new JERSEY.

No Drawing.

To all whom it may concern:

Be it known that I, WILLIAM D. PARDOE, a citizen of the United States, and a resident of Trenton, Mercer county, State of New Jersey, have invented Brake-Linings and Methods for Preparing the Same, of which the following is a specification.

@neobject of my invention is to provide an improved lining for clutches, brakes and the like which shall be capable of withstanding stresses placed upon it under operating conditions, shall possess good wearing surface and be of such a nature as not likely to be damaged by overheating.

In carrying out my invention I provide a solution whichin a typical case may con sist of twenty-six ounces of asphalt, four ounces of red lead, five ounces of sulfur, two ounces of hexamethylenetetramin in two thousand eight hundred and forty c. c. of gasolene and three hundred and fifty c. c. of benzol. 'Ihe woven or braided cloth or tape to be treated, which may be made of flax, hemp, asbestos or other fibrous material, is placed in this solution for a time suflicient to permit it to be completely impregnated or saturated, after which it is removed from the solution, thoroughly dried, and subjected to a relatively high pressure such as fifteen hundred pounds to the square inch, being at the same time heated to a temperature of from 300 to 400 F.

As a result of this treatment the materials in the fabric are vulcanized to a greater or less extent and the quantity of fixed carbon therein is materially increased, so that the finished product has an unusually high coefiicient of friction, possesses good wearing qualities, and will not become sticky when subjected to the heat to which it 13 frequently exposed under operating conditlons. Moreover the finished product produced as above described is hard, unaffected by oil and heat, and is as nearly uninflammable as it is possible to make. It is noted that the substance referred to above as asphalt is preferably the mineral compound known as gilsonite, in an'oxidized or blown form, although other hydrocarbons of an asphaltic nature maybe employed without departing from my invention.

The ,hex'amethylenetetramin is employed to'accelerate 'thevulcanization of the ma- Specification of Letters Patent.

Patented Aug. 2'7, IQI8,

Application filed March 16, 1917. Serial No. 155,330.

found the latter to give the best results.

Again, some solvent'other than a mixture of gasolene and benzol may be used for dissolving the materials specified, such for example as carbon bisulfid or carbon tetrachlorid,

Eu; I preferably utilize the substances specie It i to be noted that the lead oxid and hexamethylenetetramin may be altogether I omitted in some cases although I have found them to be particularly valuable in materially hastening the vulcanizing or oxidizing operation. 3

I claim v.

1. The method of making a brake liningwhich consists in passing a body of fabric through a'solution containing asphalt, an

oxid of lead, sulfur, and an oxidation ac- I celerator; and thereafter treating said fabric to vulcanize the material/with which it is impregnated.

2. The method of making a brake lining which consists in passing a body of fabric through a solution containing as halt; "an oxid of lead, sulfur, and an oxi ation accelerator; and thereafter subjecting said fabric to a relatively high pressureand temperature to vulcanize the material with which it is impregnated.

3. The method which consists in impregnating a fabric with asphalt; an oxid of lead, sulfur and an oxidation accelerator;

and thereafter treating said fabric to vulcanize the substances with which it is impregnated.

4. The method which consists in impregnating a body of fabric with asphalt, lead.

oxid, sulfur and an amin; and thereafter subjecting said fabric to a vulcanizing treat ment.

5. The method which consists in impregnating a body of fabric with asphalt, a lead.

oxid, sulfur and hexamethylenetetramin; and thereaftersubjecting sald fabric to a Vulcanizing process.

6. The method "which consists in passing a body of'fabric through a solution containing asphalt and sulfur to impregnate the same therewith; and thereafter subjecting said fabric to a vulcanizing process.

7 A brake lining consisting'ofa body of v fibrous material impregnated with the substance resulting from the vulcanization of a rfelixture of asphalt, a metallic oxid and sul- '8. A brake'lining consisting of a body'of fibrous material'impregnated with the prod- I 10. A brake lining consisting of a highly compressed body of fabric uniformly imperature.

. agent to 400? F.

pregnated Withthe product resulting; frcin the vulcanization of asphalt and sulfur,

11. The method of Imaking a brake lining which consists in impregnating abody of fabric with asphalt and an oxidation ac celerator; and thereafter subjecting fabric a lrelatively high pressure and tem- 12. A brake lining consisting of a highly compressed body of fabric uniformly pregnated with the product resulting the exposure of asphalt and a vulcanizing In witness whereof I afiix my signature WILLIAM n. PARDUE.

a temperature of from 300 to 

